CN102443693A - Sintering method of high-grade high-titania vanadium-titanium magnetite concentrate - Google Patents
Sintering method of high-grade high-titania vanadium-titanium magnetite concentrate Download PDFInfo
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Abstract
The invention discloses a sintering method of a high-grade high-titania vanadium-titanium magnetite concentrate. The sintering method comprises the steps of: 1) placing a mixture composed of 65-70 parts by weight of high-grade vanadium-titanium magnetite concentrates, 10-15 parts by weight of low-grade ordinary fine ores, 6-8 parts by weight of quicklime, 5-6 parts by weight of limestone, 0-2 parts by weight of steel slag, 4.6-5 parts by weight of coke powder, and return mineral powder into a mixer and adding water for mixing, with the total weight of the high-grade vanadium-titanium magnetite concentrates and the low-grade ordinary fine ores controlled at 80 wt% of the mixture excluding the return mineral powder, and with sum of the proportion of the return mineral powder in the mixture excluding the return mineral powder and the sintering yield of a sintering machine less than or equal to 1; 2) putting the mixture in a sintering cup for ignition and air draft sintering, with the FeO content of the sintered ore controlled at 7-10 wt%, th vertical sintering speed controlled at 17-20mm/min, the thickness of a material layer controlled at 650-750mm, and the sintering temperature controlled at 1250-1300DEG C. The method of the invention can optimize the burdening structure of sintering raw materials and reduce the purchase cost of raw materials.
Description
Technical field
The present invention relates to a kind of sintering method of high-Ti type V-Ti magnetite concentrate, more particularly, the present invention relates to a kind of sintering method of higher-grade high-Ti type V-Ti magnetite concentrate.
Background technology
China company is present domestic and international unique production high-Ti type V-Ti agglomerate (agglomerate TiO
2Content up to 7.5wt% about) enterprise, the used iron-bearing material of its sintering is mainly Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate (accounting for more than the ferric charge 60wt%).Because the Flos Bombacis Malabarici v-ti magnetite concentrate has TFe content low (TFe＜55wt%), coarse size (≤0.074mm accounts for 52%), low silicon (SiO
2Account for about 3.3%), high titanium (TiO
2More than 12.7%), the singularity of balling-up property and water-absorbent difference, therefore easy-sintering not, and in sintering process, can generate brittle uhligite (CaOTiO
2), sintered iron hydrochlorate low temperature bonding mutually less and its form different with ordinary sinter ore deposit calcium ferrite, cause that sinter strength is poor, yield rate is low, the rate of return mine is high, because bed permeability difference and output are also low, seriously restricted the raising of smelting strength of blast furnace simultaneously.In addition, the proportioning of vanadium titano-magnetite is high more, and the agglomerating difficulty is big more, causes the output of high-titanium type sinter, quality significantly to worsen.Research shows, the utilization coefficient of sinter machine is merely 1.0-1.1t/ (m during full vanadium titanium agglomerate SINTERING PRODUCTION
2H) (agglomerate ton amount is produced in this unit representation per hour every square metre of area), yield rate is less than 50%, and the comprehensive barrate strength (ISO) of agglomerate is merely about 65%.
Along with the specification of quality of high-Ti type V-Ti magnetite concentrate blast furnace strengthening smelting to agglomerate, the difficulty of the further raising of high-Ti type V-Ti magnetite concentrate sintering quality strengthens.For the comprehensive utilization, the strategic control that promote resource with reduce cost; Guarantee the practicality of producing simultaneously; Physics, chemical index characteristics according to the higher-grade v-ti magnetite concentrate; In conjunction with being the blast furnace ironmaking enterprise practical of main iron-bearing material with high-Ti type V-Ti magnetite concentrate, the higher-grade v-ti magnetite concentrate of having carried out under the high mixture ratio condition is produced high titanium type (TiO
2Content＞5wt%) the experimental study of agglomerate.The data investigation shows that the experimental study of the higher-grade v-ti magnetite concentrate of (dry material proportion >=60%) production high-titanium type sinter does not appear in the newspapers under the high mixture ratio condition at present.
Summary of the invention
The object of the present invention is to provide the sintering method of a kind of high mixture ratio, higher-grade v-ti magnetite concentrate.
The present invention also aims to provide a kind of v-ti magnetite concentrate sintering method that reduces cost and improve sinter quality, output.
To achieve these goals; The invention provides a kind of sintering method of higher-grade high-Ti type V-Ti magnetite concentrate; Said sintering method may further comprise the steps: 1) will packed in the mixer and added water by the compound that 65-70 part higher-grade v-ti magnetite concentrate, the low-grade common fine ore of 10-15 part, 6-8 part unslaked lime, 5-6 part Wingdale, 0-2 part slag, 4.6-5 part coke powder, the breeze of returning mine by weight form and mix; The weight sum of said higher-grade v-ti magnetite concentrate and low-grade common fine ore accounts for 80% of compound weight except that the breeze of returning mine, and the ratio that the said breeze of returning mine accounts for the compound weight except that the breeze of returning mine adds that the sintering finished rate of sinter machine is less than or equal to 1; 2) with the compound down draft sintering of lighting a fire in the sintered cup of packing into; Wherein, the FeO content range of agglomerate is controlled at 7-10wt%, vertical sintering speed is controlled at 17-20mm/min; Bed thickness is controlled at 650-750mm, and sintering temperature is controlled at 1250-1300 ℃.
Wherein, in the higher-grade v-ti magnetite concentrate content of TFe greater than 59.5wt%, SiO
2Content less than 2wt%, the content of FeO is greater than 28wt%, TiO
2Content greater than 9wt%.
Wherein, the content of TFe is 47-49wt% in the low-grade common fine ore, SiO
2Content be 17-20wt%, Al
2O
3Content less than 4wt%, TiO
2Content less than 0.5wt%.
According to the sintering method of higher-grade v-ti magnetite concentrate of the present invention, wherein, said sintering method carries out the step that granularity is controlled to said coke powder, Wingdale, the breeze of returning mine before also being included in and forming compound.
According to the sintering method of higher-grade v-ti magnetite concentrate of the present invention, wherein, the granularity of coke powder is controlled to be less than 3mm, the granularity of Wingdale is controlled to be less than 3mm, the granularity of the breeze of returning mine is controlled to be less than 5mm.
According to the sintering method of higher-grade v-ti magnetite concentrate of the present invention, wherein, in step 1), at 7.4-7.8wt%, mixing time is 5-6min with the moisture controlled in the compound.
In step 2) in, also being provided with grate-layer material in the sintered cup, the granularity of said grate-layer material is 10-16mm, the thickness of said grate-layer material is 20mm.
In step 2) in, ignition temperature is 1100 ℃-1150 ℃, and be 2-2.5min ignition time, and the igniting negative pressure is 5.5-6kPa, and sintering exhausting negative pressure is 11.5-12.5kPa, the exhausting flow is 5-15m
3/ min.
According to the sintering method of higher-grade v-ti magnetite concentrate of the present invention, wherein, the sintering basicity of said method is 2.20-2.75.
The present invention has compared with prior art improved the mineral composition and the structure of agglomerate, thereby improves quality, the output of agglomerate and reduced raw materials cost.
Embodiment
To describe sintering method below in detail according to the higher-grade high-Ti type V-Ti magnetite concentrate of the embodiment of the invention.
According to rock character, sintering basic characteristic (fusing property, same voltinism), the gangue kind of iron-bearing material with quantity, ore structure, granularity are sewed and mend, the metallurgical performance of agglomerate, raw material for sintering has been carried out suitable proportioning according to the higher-grade high-Ti type V-Ti magnetite concentrate sintering method of the embodiment of the invention.
Table 1 shows the benchmark mix proportion scheme and according to the raw materials for sintering proportioning situation of four mix proportion schemes of the embodiment of the invention.
The proportioning situation (according to weight percent meter) of table 1 raw materials for sintering
Can know that by table 1 proportioning in the benchmark mix proportion scheme specifically comprises Flos Bombacis Malabarici v-ti magnetite concentrate, Australian fine ore, the common fine ore of domestic higher-grade, low-grade common fine ore and flux (slag, unslaked lime, Wingdale), fuel (coke powder), the breeze etc. of returning mine.And in A of the present invention, B, C, D, five mix proportion schemes of E, its proportioning specifically comprises higher-grade v-ti magnetite concentrate, low-grade common fine ore and flux (slag, unslaked lime, Wingdale), fuel (coke powder), the breeze etc. of returning mine.
In the proportioning process of above-mentioned raw materials, the breeze of returning mine is taked the outer method of joining, promptly extra with addition of.In actual production; The weight sum of higher-grade v-ti magnetite concentrate and low-grade common fine ore is controlled to be 80% of the compound weight that accounts for except that the breeze of returning mine, the ratio of rest materials is fixing and can require do suitable adjustment according to producing the agglomerate composition.
Above-mentioned raw materials used main physical and chemical indexes is (each components in proportions all is weight percentage):
Flos Bombacis Malabarici v-ti magnetite concentrate: ω (TFe) 53.8-54%, ω (SiO
2)＞3.5%, ω (FeO)＞30%, ω (TiO
2)＞12.5%, and ω (granularity＜0.074mm)＞60%;
Australia fine ore: ω (TFe) 62%-63%, ω (SiO
2) 3-4%, ω (Al
2O
3)＜3%, ω (TiO
2)＜0.5%;
The common fine ore of domestic higher-grade: ω (TFe) 58%-60%, ω (SiO
2) 6-9%, ω (Al
2O
3)＜3%, ω (TiO
2)＜0.5%;
Higher-grade high-Ti type V-Ti magnetite concentrate: ω (TFe)＞59.5%, ω (SiO
2)＜2%, ω (FeO)＞28%, ω (TiO
2)＞9%, and ω (granularity＜0.074mm)＞70%;
Low-grade common fine ore: ω (TFe) 47-49%, ω (SiO
2) 17-20%, ω (Al
2O
3)＜4%, ω (TiO
2)＜0.5%;
Slag: ω (TFe) about 25%, ω (SiO
2) 6-8%, ω (Al
2O
3)＜4%, ω (CaO)＞35%, ω (TiO
2)＜5%;
Unslaked lime: ω (CaO) 86-88%;
Wingdale: ω (staple CaO) 50-53%, and ω (granularity＜3mm)=100%;
Coke powder: ash content 12-15%, ω (granularity＜3mm)=100%;
Breeze: the ω (TFe) about 50% that returns mine, ω (SiO
2) 5-5.2%, ω (CaO) 11.5-12%, ω (granularity＜5mm)=100%.
After having confirmed various proportion of raw materials, before carrying out raw materials mix, preferably, raw materials such as coke powder, Wingdale, the breeze of returning mine are carried out granularity control.Specifically, raw materials such as coke powder, Wingdale, the breeze of returning mine are carried out granularity control can be controlled to be through granularity, the granularity of Wingdale is controlled to be less than 3mm, the granularity of the breeze of returning mine is controlled to be less than 5mm realizes less than 3mm with coke powder.Preferably, adopt the screening mode to strengthen the processing of sieving to raw material.Because limestone granularity is thicker, it is difficult for and iron ore reacted CaOSiO in sintering process
2The bonding phase also produces white point, reduces the intensity of agglomerate, therefore is necessary the granularity of Wingdale is controlled; And as the breeze granularity of returning mine in finished product ore deposit if less than 5mm, then help reducing the secondary processing fuel consumption and can enhance productivity; Simultaneously, raw materials such as coke powder have less granularity can accelerate combustionvelocity, improves sintering velocity.
In the mix proportion scheme of compound, slag is not essential, but handles as the waste residue of iron and steel enterprise, and general consideration is added, and adding proportion is 0-2wt%.Usually, sinter machine all can produce a certain amount of returning mine, return mine with the finished product agglomerate formed whole agglomerate that the sinter machine sintering is produced.In the method for the invention, the ratio that accounts for the compound weight except that the breeze of returning mine of the breeze of returning mine in the compound adds that the sintering finished rate of sinter machine should be less than or equal to 1.The mode that above-mentioned utilization of the present invention is returned mine, the one, can increase that granularity is the particle ratio of 1-5mm in the compound, it can be used as and adheres to the atomic core of granularity less than 0.15mm, suitably improves mixture ventilation, improves sintering velocity; The 2nd, compound can not all sinter the finished product ore deposit greater than 5mm into; The yield rate of agglomerate is about 70-75wt%, and then the rate of return mine is 25-30wt%, because the composition of returning mine is roughly suitable with finished product agglomerate composition; Therefore this part is returned mine and must return sintering again, to form the quantity of return mines balance.
Next, according to the proportioning ratio of a plurality of schemes shown in the table 1, with higher-grade v-ti magnetite concentrate, low-grade common fine ore, unslaked lime, Wingdale, slag, coke powder, returning mine to allocate into adds water behind the blending bunker and mix in mixer.In mixing process, the moisture in the control compound is 7.4-7.8wt%, and mixing time is 5-6min.Because the existence of moisture can make the thinner powdered iron ore of granularity adhere on the big slightly particle in the compound, forming granularity is the compound about 3mm.If moisture is big more, then the compound of 3mm grade is many more, and the ventilation property of compound is good more, and sintering velocity is fast more, and agglomerate is fixed, the time of mineralising is also short more, and this will reduce the quality of agglomerate, but can enhance productivity; Otherwise, sinter quality is risen, but production efficiency descends.Therefore, when the proportioning of v-ti magnetite concentrate is higher, need the moisture content in the compound be controlled in the suitable scope to coordinate sinter quality and production efficiency.
Next, with the compound down draft sintering of lighting a fire in the sintered cup of packing into.Wherein, the diameter of sintered cup is 300mm, highly is also to be provided with grate-layer material in the sintered cup by 800mm, and the granularity of grate-layer material is that 10-16mm, thickness are 20mm, and bed thickness is 650-750mm (containing grate-layer material thickness).During sintering, ignition temperature is 1100 ℃-1150 ℃, and be 2-2.5min ignition time, and the igniting negative pressure is 5.5-6kPa, and sintering exhausting negative pressure is 11.5-12.5kPa, and the exhausting flow is 5-15m
3/ min can be through regulating the sintering velocity of parameter control compounds such as sintering exhausting negative pressure, exhausting flow.
High-Ti type V-Ti magnetite concentrate sintering conditions for successful is to make compound calcium ferrite replace silicate to make the bonding phase.Therefore, remove high-alkali being outside one's consideration, low-temperature sintering and oxidizing atmosphere also are to guarantee the successful prerequisite of sintering.In the sintering operation process according to the embodiment of the invention: the FeO content range is controlled at 7-10wt%, and vertical sintering speed is controlled at 17-20mm/min, and bed thickness is controlled at 650-750mm, and sintering temperature is controlled at 1250-1300 ℃.Guarantee sintering atmosphere hyperoxia position like this, suppressed the vanadium haplotypite generates hardness height, intensity difference in sintering process uhligite simultaneously.As stated; Sintering process operation according to the embodiment of the invention; Adopt deep-bed sintering can reduce vertical sintering speed, prolong the high temperature hold-time, guarantee the mineral sufficient crystallising; Have vital role to improving sinter strength and yield rate, it is not enough to have remedied the high-Ti type V-Ti magnetite concentrate agglomerating.
Wherein, the control of sintering temperature is main relevant with sintering material layer thickness, moisture and coke powder ratio, the bed of material is thick more, moisture more less and the coke powder ratio high more, the top temperature of sintered layer height just then.Because sintering temperature can't directly monitor and control, and generally is to control through regulating other parameters in the actual production, the sintering temperature among the present invention is controlled at the generation that is beneficial to low temperature bonding phase calcium ferrite in the sintering process between 1250-1300 ℃.
In the sintering process, when the spent air temp of sintered cup lower end air draft pipe rises to the highlyest when dropping to 300 ℃ again, sintering process finishes.Sinter cake is poured out and carried out just broken (spacing of crusher is 50mm); Carry out again falling for 3 times processing (height of fall is 2m) back by 40-25mm, 25-16mm, 16-10mm, 10-5mm,＜5mm sieves respectively; Calculate granularity at last greater than the shared ratio of the sintered material of 5mm, and according to GB GB3209 canonical measure sintered ore rotary drum strength.Technique effect for the ease of the contrast and the understanding embodiment of the invention has also specifically provided existing benchmark mix proportion scheme sintering experiment and result commonly used here.
The benchmark example
Each material component is shown in the benchmark in the table 1.Be specially: the Flos Bombacis Malabarici v-ti magnetite concentrate is with addition of 48%, and Australian fine ore proportioning is 10%, and the common fine ore proportioning of domestic higher-grade is 20%; Domestic low-grade common fine ore proportioning is 2%; The unslaked lime proportioning is 7%, and the Wingdale proportioning is 6.2%, and dosage of coke is 4.8%; The slag proportioning is 2%, and the breeze proportioning of returning mine is 25%.Sintering basicity (the CaO/SiO in the agglomerate
2Ratio) be controlled to be 2.10 ± 0.05, quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.4 ± 0.1wt%.
The result shows that granularity reaches more than the 55wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 73.3%, and sintering finished rate is 74.0wt%, and the TFe grade of agglomerate is 49.0wt%, SiO
2Content is 5.5wt%, TiO
2Content is 6.7wt%.
According to the sintering example of embodiments of the invention 1 to embodiment 5 for carrying out according to the proportioning raw materials of the A in the table 1, B, C, D, five schemes of E respectively.Concrete situation is following:
Embodiment 1
Option A
The higher-grade v-ti magnetite concentrate is with addition of 65%, and low-grade common fine ore proportioning is 15%, and the breeze proportioning of returning mine is 25%; The unslaked lime proportioning is 7%, and the Wingdale proportioning is 6.2%, and dosage of coke is 4.8%; Quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.5 ± 0.1wt%.
The result shows that granularity reaches more than the 60wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 74%, and sintering finished rate is 75wt%, and the TFe grade of agglomerate is 50.1wt%, SiO
2Content is 5.3wt%, TiO
2Content is 6.5wt%, and sintering basicity is 2.25 ± 0.05.
Embodiment 2
Option b
The higher-grade v-ti magnetite concentrate is with addition of 65%, and low-grade common fine ore proportioning is 15%, and the breeze proportioning of returning mine is 25%; The unslaked lime proportioning is 8%; The Wingdale proportioning is 5.2%, and the slag proportioning is 2%, and dosage of coke is 4.8%; Quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.6 ± 0.1wt%.
The result shows that granularity reaches more than the 65wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 75%, and sintering finished rate is 76wt%, and the TFe grade of agglomerate is 50wt%, SiO
2Content is 5.2wt%, TiO
2Content is 6.5wt%, and sintering basicity is 2.3 ± 0.05.
Embodiment 3
Scheme C
The higher-grade v-ti magnetite concentrate is with addition of 68%, and low-grade common fine ore proportioning is 12%, and the breeze proportioning of returning mine is 25%; The unslaked lime proportioning is 7%; The Wingdale proportioning is 6.2%, and the slag proportioning is 2%, and dosage of coke is 4.8%; Quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.6 ± 0.1wt%.
The result shows that granularity reaches more than the 60wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 74%, and sintering finished rate is 74.5wt%, and the TFe grade of agglomerate is 50.4wt%, SiO
2Content is 4.8wt%, TiO
2Content is 6.8wt%, and sintering basicity is 2.45 ± 0.05.
Embodiment 4
Scheme D
The higher-grade v-ti magnetite concentrate is with addition of 68%, and low-grade common fine ore proportioning is 12%, and the breeze proportioning of returning mine is 25%; The unslaked lime proportioning is 8%; The Wingdale proportioning is 5.2%, and the slag proportioning is 2%, and dosage of coke is 4.8%; Quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.7 ± 0.1wt%.
The result shows that granularity reaches more than the 65wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 74.5%, and sintering finished rate is 75wt%, and the TFe grade of agglomerate is 50.2wt%, SiO
2Content is 4.8wt%, TiO
2Content is 6.8wt%, and sintering basicity is 2.50 ± 0.05.
Embodiment 5
Scheme E
The higher-grade v-ti magnetite concentrate is with addition of 70%, and low-grade common fine ore proportioning is 10%, and the breeze proportioning of returning mine is 25%; The unslaked lime proportioning is 7%; The Wingdale proportioning is 6.2%, and the slag proportioning is 2%, and dosage of coke is 4.8%; Quicklime slaking water ratio is 2: 1, and sintered mixture moisture is 7.8 ± 0.1wt%.
The result shows that granularity reaches more than the 67wt% greater than the sinter mixture proportion of 3mm, and sintered ore rotary drum strength is 73.0%, and sintering finished rate is 72.3wt%, and the TFe grade of agglomerate is 50.5wt%, SiO
2Content is 4.3wt%, TiO
2Content is 7.0wt%, and sintering basicity is 2.70 ± 0.05.
Therefore, can know, implement high-basicity sintering, improve the unslaked lime ratio, improve mixture moisture content, increase high SiO from the foregoing description
2The ratio of the common fine ore of content makes higher-grade high-Ti type V-Ti magnetite concentrate sintering effect good than the benchmark example; Granularity is brought up to more than the 67wt% by 55wt% greater than the sinter mixture proportion of 3mm; The basicity and the TFe grade of agglomerate all are improved simultaneously; Both improved the ventilation property of sinter mixture, and also improved the generation of compound calcium ferrite, sintered ore rotary drum strength (ISO) has improved 0.7-1.7 percentage point; Yield rate improves 0.5-2 percentage point, and the TFe grade improves 1-1.4 percentage point.
The comprehensive relatively experimental result of the foregoing description is thought; According to embodiments of the invention; The ratio of higher-grade high-Ti type V-Ti magnetite concentrate in raw materials for sintering is that the effect of the ratio of 65-70wt% and low-grade common fine ore when being 12-15wt% is better, the SiO of agglomerate
2Content is that 5.0 ± 0.2wt% is comparatively suitable.
In sum, the sintering method of higher-grade high-Ti type V-Ti magnetite concentrate of the present invention is (wherein not contain TiO with addition of the low-grade common fine ore of part in proportioning in greater than the higher-grade high-Ti type V-Ti magnetite concentrate of 65wt%
2), through the TiO in the control agglomerate
2And SiO
2Measures such as content, sintering basicity and sintering parameter improve the TFe grade of agglomerate and improve the mineral composition and the structure of agglomerate, thereby improve quality, the output of agglomerate, can significantly reduce raw materials cost.Therefore; Improve the unslaked lime proportioning through taking to strengthen, strengthen the measure of granulation sintering; Under the higher-grade high-Ti type V-Ti magnetite concentrate condition of high mixture ratio, the yield rate of high-titanium type sinter is reached more than the 74wt%, sintered ore rotary drum strength reaches more than 74%; The TFe grade reaches more than the 50wt%, and productivity of sintering machine reaches 1.3t/ (m
2H) more than.The present invention is significant for batching structure, control higher-grade v-ti magnetite concentrate resource, the reduction purchasing of raw materials cost of optimization raw materials for sintering.
Although specifically described the sintering method of higher-grade high-Ti type V-Ti magnetite concentrate with reference to embodiments of the invention; But those skilled in the art will be appreciated that; Under the situation that does not break away from the spirit and scope of the present invention, can make various forms of changes to embodiment.
Claims (9)
1. the sintering method of a higher-grade high-Ti type V-Ti magnetite concentrate, said sintering method may further comprise the steps:
1) will pack in the mixer and add water by the compound that 65-70 part higher-grade v-ti magnetite concentrate, the low-grade common fine ore of 10-15 part, 6-8 part unslaked lime, 5-6 part Wingdale, 0-2 part slag, 4.6-5 part coke powder, the breeze of returning mine by weight form and mix; The weight sum of said higher-grade v-ti magnetite concentrate and low-grade common fine ore accounts for 80% of compound weight except that the breeze of returning mine, and the ratio that the said breeze of returning mine accounts for the compound weight except that the breeze of returning mine adds that the sintering finished rate of sinter machine is less than or equal to 1;
2) with the compound down draft sintering of lighting a fire in the sintered cup of packing into,
Wherein, the FeO content range of agglomerate is controlled at 7-10wt%, vertical sintering speed is controlled at 17-20mm/min, and bed thickness is controlled at 650-750mm, and sintering temperature is controlled at 1250-1300 ℃.
2. sintering method according to claim 1 is characterized in that, in the said higher-grade v-ti magnetite concentrate content of TFe greater than 59.5wt%, SiO
2Content less than 2wt%, the content of FeO is greater than 28wt%, TiO
2Content greater than 9wt%.
3. sintering method according to claim 1 is characterized in that, the content of TFe is 47-49wt% in the said low-grade common fine ore, SiO
2Content be 17-20wt%, Al
2O
3Content less than 4wt%, TiO
2Content less than 0.5wt%.
4. sintering method according to claim 1 is characterized in that, said sintering method carries out the step that granularity is controlled to said coke powder, Wingdale, the breeze of returning mine before also being included in and forming compound.
5. sintering method according to claim 4 is characterized in that, the granularity of coke powder is controlled to be less than 3mm, and the granularity of Wingdale is controlled to be less than 3mm, and the granularity of the breeze of returning mine is controlled to be less than 5mm.
6. sintering method according to claim 1 is characterized in that, in step 1), at 7.4-7.8wt%, mixing time is 5-6min with the moisture controlled in the compound.
7. sintering method according to claim 1 is characterized in that, in step 2) in, also being provided with grate-layer material in the sintered cup, the granularity of said grate-layer material is 10-16mm, the thickness of said grate-layer material is 20mm.
8. sintering method according to claim 1 is characterized in that, in step 2) in, ignition temperature is 1100 ℃-1150 ℃, and be 2-2.5min ignition time, and the igniting negative pressure is 5.5-6kPa, and sintering exhausting negative pressure is 11.5-12.5kPa, the exhausting flow is 5-15m
3/ min.
9. sintering method according to claim 1 is characterized in that, the sintering basicity of said method is 2.20-2.75.
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| CN102978384A (en) * | 2012-12-24 | 2013-03-20 | 首钢总公司 | Method for using steel slags during sintering |
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| CN104480299A (en) * | 2015-01-14 | 2015-04-01 | 东北大学 | Method for preparing sintered ores by adding waste slag to chromium-containing-type vanadium-titanium magnetite concentrates |
| CN104630457A (en) * | 2015-02-09 | 2015-05-20 | 东北大学 | Method for preparing sinter by sintering titanium-iron concentrate |
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| CN114622088A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for controlling particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron concentrate |
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| CN116119723A (en) * | 2022-12-20 | 2023-05-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for preparing melt-type calcium ferrite by preoxidation of vanadium-titanium magnetite concentrate |
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